我需要在 C++ 中对 std::string 进行简单的压缩和解压缩。我看了这个site代码用于字符数组。我要实现的是两个功能:
std::string original = "This is to be compressed!!!!";
std::string compressed = string_compress(original);
std::cout << compressed << std::endl;
std::string decompressed = string_decompress(compressed);
std::cout << decompressed << std::endl;
我试过 boost 压缩:
std::string CompressData(const std::string &data)
{
std::stringstream compressed;
std::stringstream decompressed;
decompressed << data;
boost::iostreams::filtering_streambuf<boost::iostreams::input> out;
out.push(boost::iostreams::zlib_compressor());
out.push(decompressed);
boost::iostreams::copy(out, compressed);
return compressed.str();
}
std::string DecompressData(const std::string &data)
{
std::stringstream compressed;
std::stringstream decompressed;
compressed << data;
boost::iostreams::filtering_streambuf<boost::iostreams::input> in;
in.push(boost::iostreams::zlib_decompressor());
in.push(compressed);
boost::iostreams::copy(in, decompressed);
return decompressed.str();
}
但代码有时会在字符串中给出 Null 字符,即 \u0000。如果压缩数据中包含这些空字符,我该如何处理。返回类型 string 是否正确?如何使用 zlib 实现函数 string_compress 和 string_decompress?
最佳答案
您可以按照@LawfulEvil 的建议进行操作。这是有效的代码片段:)
std::string original = "This is to be compressed!!!!";
std::string compressed_encoded = string_compress_encode(original);
std::cout << compressed_encoded << std::endl;
std::string decompressed_decoded = string_decompress_decode(compressed_encoded);
std::cout << decompressed_decoded << std::endl;
使用 this作为 base64
编码/解码库。
#include <sstream>
#include <boost/iostreams/filtering_streambuf.hpp>
#include <boost/iostreams/copy.hpp>
#include <boost/iostreams/filter/zlib.hpp>
#include <cpp-base64/base64.h>
std::string string_compress_encode(const std::string &data)
{
std::stringstream compressed;
std::stringstream original;
original << data;
boost::iostreams::filtering_streambuf<boost::iostreams::input> out;
out.push(boost::iostreams::zlib_compressor());
out.push(original);
boost::iostreams::copy(out, compressed);
/**need to encode here **/
std::string compressed_encoded = base64_encode(reinterpret_cast<const unsigned char*>(compressed.c_str()), compressed.length());
return compressed_encoded;
}
std::string string_decompress_decode(const std::string &data)
{
std::stringstream compressed_encoded;
std::stringstream decompressed;
compressed_encoded << data;
/** first decode then decompress **/
std::string compressed = base64_decode(compressed_encoded);
boost::iostreams::filtering_streambuf<boost::iostreams::input> in;
in.push(boost::iostreams::zlib_decompressor());
in.push(compressed);
boost::iostreams::copy(in, decompressed);
return decompressed.str();
}
关于c++ - 简单的 Zlib C++ 字符串压缩和解压缩,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27529570/